Abstract:
Traditional active damping control methods are mostly based on fixed parameter adjustment, which has poor adaptability to complex working conditions and is difficult to effectively suppress inverter resonance. Therefore, the study proposes an active damping control method for high-power energy storage inverters based on virtual oscillators. Firstly, establish a mathematical model for high-power energy storage inverters and describe their dynamic characteristics; based on the principle of virtual oscillator, design an adaptive adjustment mechanism for inverter parameters to enable the inverter to respond in real-time to changes in operating conditions; constructing an active damping control strategy for high-power energy storage converters, utilizing virtual oscillators to dynamically adjust the characteristics of the high-power energy storage converters and suppress resonance. The experimental results show that the total harmonic distortion (THD) of the inverter is less than 2% under all test conditions, meeting the standard requirement of <5%. Compared with traditional methods, this method has an average attenuation of 18.3 dB in the six period resonance peak, and the resonance peak fluctuation is only ±0.9 dB, which has significant advantages in resonance suppression.